Which of the following is correct about the assembly of chromosome: A: nucleosome→core histone octamer→solenoid→microstrip→loop domain→chromatid B: core histone octamer→nucleosome→solenoid→loop domain→microstrip→chromatid C: core histone octamer→nucleosome→microstrip→solenoid→loop domain→chromatid D: core histone octamer→nucleosome→solenoid→microstrip→loop domain→chromatid

solenoid valve A: 电磁阀 B: 空气管 C: I/O电缆 D: 手工布线

In a refrigeration system, if the cooling water to the condenser fails, the（）. A: box temperature solenoid valve will close B: expansion valve will close C: compressor will shutdown D: king valve will ope

The cylinder head starting valve of ME type diesel engine is controlled by . A: Mechanical air distributor B: solenoid valve controlled by electronic control system C: The main starting valve D: The camshaft

When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is: A: 0.25 B: 0.50 C: 1 D: 2 E: 4

1) What happens to the magnitude of the magnetic field inside a long solenoid if the current is doubled? A: It becomes four times larger. B: It becomes twice as large. C: It is unchanged. D: It becomes one-half as large. E: It becomes one-fourth as large.

5) Which one of the glowing magnetic field gives the largest magnitude? A: the field 2 cm away from a long, straight wire carrying a current of 3 A B: the field at the center of a flat, compact, circular coil, 2 cm in radius, with 10 turns, carrying a current of 0.3 A C: the field at the center of a solenoid 2 cm in radius and 200 cm long, with 1000 turns, carrying a current of 0.3A D: the field at the center of a long, straight, metal bar, 2 cm in radius, carrying a current of 300 A E: a field of 1 mT